Gaia23cer as a possible new eclipsing SU UMa type dwarf nova
ATel #16240; A. O. Simon, A. V. Grytsai (ASPD TShNU of Kyiv), V. O. Ponomarenko (KAO TShNU of Kyiv), K. Kaziemova, M. Solomakha, O. Pastoven, M. Bilodid, O. Bilous, A. Horbenko, D. Sopilka (ASPD TShNU of Kyiv)
on 12 Sep 2023; 15:17 UT
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Credential Certification: Andrew Simon (skazhenijandrew@gmail.com)
Subjects: Optical, Binary, Cataclysmic Variable, Star, Transient, Variables
Referred to by ATel #: 16249
We report the results of recent photometric observations of AT2023row/Gaia20cer performed on 2023, September 09 with the AZT-8 0.7-m f/4 reflector at the Lisnyky observation station of Taras Shevchenko National University of Kyiv.
Outburst in candidate CV Gaia20cer/AT2023row (ZTF18abunixr) was discovered on 2023-08-31 by S.T. Hodgkin, E. Breedt, A. Delgado, D.L. Harrison, M. van Leeuwen, G. Rixon, T. Wevers, A. Yoldas (IoA Cambridge), N. Ihanec, K. Kruszynska, K.A. Rybicki, L. Wyrzykowski (Warsaw University Astronomical Observatory), Z. Kostrzewa-Rutkowska (Leiden Observatory), D. Eappachen (SRON/RU), G. Marton (Konkoly Observatory), on behalf of the Gaia Alerts team at magnitude G = 16.34. From observations taken at the Lisnyky observation station on 2023-09-09 (JD 2460197.51 - 2460197.58) we detected strong double wave periodicity (early superhumps?) with the period 0.065(6) d using ISDA package (Pelt, Jaan. Irregularly Spaced Data Analysis User Manual, Printed by Helsinki University, 267 pp. (1992)). Also in the light curve it is clearly seen the presence of eclipse with duration of 0,00518 d (approx. 7.5 min). During the eclipse object became invisible on the images. Taking into account that the outburst amplitude is about 3-4 mag, period during outburst is 0.065(6)d and in the light curve we see clear eclipse we can suggest that this object appears to be a new eclipsing SU UMa type dwarf nova during the superoutburst. Further observations are highly encouraged.
We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts), as well as Cambridge Photometry Calibration Server (CPCS) (http://gsaweb.ast.cam.ac.uk/followup/).